The Apex Index

The traditional fuel-burning part of an F1 power unit: a 1.6-litre, six-cylinder, turbocharged petrol engine. In 2026 it remains, but it now provides only about half the car's total power. The other half comes from the electric system.

An electric motor-generator connected to the drivetrain. It harvests energy when the driver brakes (converting braking force into electricity stored in the battery), and deploys energy when the driver accelerates (adding power to the wheels). For 2026 it's been beefed up to handle roughly three times as much energy as before.

The component that used to harvest energy from exhaust gas heat in earlier hybrid F1 cars. Removed for 2026, because it was considered too complex and not relevant to road-car technology.

The collective name for all the electric components in an F1 power unit: the battery, the control electronics, and the MGU-K. The system that captures energy from braking and lift-offs and reuses it as extra power.

The battery pack that stores the electrical energy harvested by the MGU-K. It is the reservoir the car draws from when it deploys electrical power. Its state of charge is managed carefully across every lap so the driver is never left with an empty battery at the wrong moment.

The car's central control computer. It governs how and when energy is deployed and harvested, how the engine maps behave, and how the active aero switches between modes. Every team runs a standard FIA-supplied ECU so that software cannot be used to gain a hidden advantage.

The system that monitors the battery's temperature, voltage and overall health, and protects it from damage. If it detects a dangerous fault, such as a problem inside the battery pack, it can trigger a shutdown to stop further harm. A BMS intervention can end a driver's race even when nothing has mechanically broken.

How full the battery is at any given moment, given as a percentage. Managing state of charge sits at the heart of 2026 racing. A driver who reaches a long straight with a low state of charge has less electrical power to deploy, which is why energy management across a lap matters so much.

The spread in voltage between the individual cells inside the battery pack. Ideally every cell sits at a similar voltage. A large dispersion means some cells are working harder or degrading faster than others, which the BMS watches closely as an early warning sign of an unhealthy pack.

The 2026 target where roughly half the car's total power comes from the petrol engine and the other half from the electric system. A major shift from previous years, when the electric contribution was a smaller boost on top of the engine.

Running the engine at slightly less than maximum power while harvesting electrical energy at the same time. Lets the car top up the battery during a flat-out lap without significantly losing top speed. The FIA targets a super-clip window of about 2-4 seconds per lap.

The slice of each lap during which super-clipping is allowed to happen. Rather than harvesting across the whole lap, the car is limited to a short burst, roughly 2-4 seconds of clipped running per lap in total, as targeted by the FIA. Keeping it to a small window lets the car top up the battery without giving away much lap time. Those 2-4 seconds do not have to come all at once, they are the combined amount of clipped running spread across the lap.

Energy harvesting that happens when the driver lifts off the throttle without braking. The MGU-K acts as a generator, slowing the car slightly while topping up the battery. Common through medium-load corners.

The general term for the act of harvesting energy back into the battery, whether through braking, throttle lift, or super-clipping. The maximum permitted recharge per lap was reduced from 8MJ to 7MJ from Miami onwards.

A manual control the driver presses to deploy a burst of stored electrical power. Unlike Overtake Mode (which is proximity-triggered), Boost is at the driver's discretion. From Miami 2026 onwards, the boost is capped at +150 kW in race conditions.

From 2026, all F1 cars run on fuels made either from non-food biomass (waste material) or as e-fuels (synthesised from atmospheric CO₂ and hydrogen). Part of F1's roadmap to net-zero carbon by 2030.

The 2026 system where moveable front and rear wings change shape during a lap, controlled automatically by the engine maps. They open on straights (for low drag and high top speed) and close in corners (for high downforce and grip). Available all the time, on all cars, replacing the DRS system that was only usable when within one second of the car ahead.

The active aero configuration with wings open and flat. Minimum drag, allowing maximum top speed. Activated automatically on straights.

The active aero configuration with wings closed. Maximum downforce for cornering grip. Activated automatically entering and through corners.

The aerodynamic device at the front of the car. In 2026 it's been simplified with fewer elements (the razor-like cascade is gone), and the "eyebrow" winglets above the front wheels have been removed. The new shape directs airflow inward rather than outward.

The underside of the car. The single biggest source of downforce on any modern F1 car. In 2026 it's 100-150mm narrower than the previous generation, and the deep Venturi tunnels have been removed in favour of a flatter design.

The upward-curving section at the rear of the floor. It accelerates air under the car as it exits at the back, creating a low-pressure zone that sucks the car onto the track. In 2026 it's much larger than before, to compensate for the removal of Venturi tunnels.

The deep channels under previous-generation F1 cars (2022-2025) that created ground-effect downforce by accelerating airflow under the floor. Removed for 2026. Floors are now flatter, with much of the downforce work shifted to a larger rear diffuser.

Aerodynamic devices fitted behind the front wheels that push turbulent airflow INWARDS, towards the centre of the car. The opposite philosophy of the previous generation's "out-washing." The goal is to leave a cleaner wake behind the car so a following driver can stay close without losing front-end grip.

The turbulent, disturbed air left behind a car. It helps on a straight, where it becomes the tow, but in corners it robs the following car of downforce because its wings and floor are working in messy airflow rather than clean air. Cutting dirty air was a core aim of the 2026 rules, using in-washing bargeboards to leave a cleaner wake for the car behind.

The pull a following car gets from running in the wake of the car ahead. The lead car punches a hole in the air, leaving a pocket of lower-pressure, faster-moving air behind it that cuts drag for the car following. A driver uses the tow down a straight to close up and set up an overtake.

Another word for the tow. The region of disturbed, lower-drag air directly behind a car that a following driver can sit in to gain straight-line speed. Slipstreaming is the act of choosing to run in that pocket to carry more speed than would be possible in clean air.

The previous overtaking aid (2011-2025) that opened a flap in the rear wing to reduce drag and increase straight-line speed. Available only to cars within one second of the car ahead, and only on designated straights. Replaced for 2026 by Active Aerodynamics (the mechanical successor) and Overtake Mode (the strategic successor).

Pirelli brings five dry-weather slick compounds, numbered C1 (hardest) to C5 (softest). At each race they nominate three of these compounds and rename them Hard, Medium, and Soft for that weekend. For example, Miami 2026 used C3/C4/C5, the softest possible trio.

The three race-weekend nicknames for the three compounds Pirelli has brought, regardless of which actual C-grade they are. Hard wears slowest and goes longest. Soft is fastest but degrades quickly. Medium is the compromise. The actual rubber inside each varies from race to race.

The core compromise behind tyre choice. Softer compounds (a higher C number) give more grip and faster lap times but wear out and lose performance quickly. Harder compounds (a lower C number) are slower over one lap but last far longer and cope better with heat. Deciding which to run, and when, is the heart of race strategy.

The everyday nickname for Pirelli's dry-weather tyres, the smooth treadless tyres used when the track is dry. When a driver is said to be on slicks it means any of the dry compounds (hard, medium or soft) rather than the grooved intermediate or wet tyres.

The period during which a driver uses one set of tyres before pitting. A "21-lap stint on the medium compound," for example. A "long stint" is one that stretches close to the limit of the tyre's life.

Loss of tyre grip caused by the rubber overheating beyond its optimal working window. Affects lap times progressively, even before the tread physically wears out. A key factor on hot, abrasive circuits.

A form of tyre damage where the rubber overheats deep inside, and pockets of gas form and burst through to the surface, leaving raised blisters. It happens when a tyre runs too hot for too long, and it costs grip because the surface is no longer smooth and even.

A surface tearing that happens when a tyre is too cold or is sliding too much. Small pieces of rubber tear away and roll up on the surface, so the tyre ends up running on top of its own shredded rubber. It costs grip until the graining clears, and it is most common early in a stint or in cold conditions.

When a driver brakes so hard that a wheel stops turning while the car is still moving, so the tyre skids across the track. It usually happens under heavy braking into a corner, costs time as the car runs wide, and often leaves a flat-spot behind.

A worn patch on one part of the tyre caused by a lock-up, where the wheel stops rotating and drags across the track. The flattened area sends vibration through the whole car and costs grip, and a bad flat-spot can force an early pit stop.

A heated cover that wraps around the tyres before they're fitted to the car, pre-warming them to optimal temperature. Without blankets, the first lap or two out of the pits would be on cold (and therefore low-grip) tyres.

The width of rubber that contacts the road. In 2026 the tread width has been reduced by 25mm at the front and 30mm at the rear, making the tyres noticeably narrower than the previous generation.

The raised chunks of rubber in the grooved pattern of intermediate and wet tyres, separated by channels that pump water away from the contact patch. Slick tyres have no tread blocks, because a smooth surface puts the most rubber on the road for maximum dry grip.

Pirelli's two tread-patterned tyres for wet conditions. Intermediates are for damp tracks with no standing water. Full wets are for heavy rain with standing water on the surface.

The set of characteristics Pirelli scores for every circuit, usually on a low-to-high scale, to explain the demands a track places on the tyres. They include traction (putting power down out of slow corners), braking, lateral energy (cornering loads), tyre stress, asphalt grip, asphalt abrasion (how rough the surface is and how quickly it wears tyres), downforce level and track evolution. Reading these ratings gives a strong clue about which compounds Pirelli will bring and how many stops a race is likely to need.

The line running through the centre of the two front wheels, and the assembly that connects them to the car. Many car measurements are taken relative to the front and rear axles, and the distance between the two is the wheelbase. Suspension geometry at the front axle has a big effect on how sharply the car turns into a corner.

A setting that changes how the brake balance shifts during a single braking zone. As the driver brakes hard and then releases into the corner, the balance can migrate between the front and rear axles to keep the car stable under heavy braking and help it rotate on entry. It works alongside brake-by-wire on the rear axle, and drivers fine-tune it corner by corner.

The line running through the centre of the two rear wheels, and the assembly that connects them to the car. It is where the power unit puts its drive down to the road, and together with the front axle it sets the wheelbase. Brake balance and brake migration shift braking force between the front and rear axles.

The twisting force the brakes apply to slow a wheel down. More braking torque means harder stopping, but too much at one axle can stop the wheel turning and cause a lock-up. Balancing braking torque between the front and rear axles is exactly what brake balance and brake migration control.

Openings that channel cool air onto the brakes to stop them overheating. Carbon brakes only work well in a fairly narrow temperature window, so teams size the ducts for each circuit, larger for heavy-braking tracks and smaller where cooling matters less. Too little cooling risks the brakes overheating, and too much adds drag and can leave them below their working temperature.

The fluid that carries the pressure from the brake pedal, through the brake-by-wire system, to the calipers that squeeze the discs. It has a very high boiling point because F1 brakes run extremely hot. If the fluid boils, gas bubbles form and the pedal goes soft, which causes a dangerous loss of braking.

A hard, shiny layer that forms on the surface of the brake pads when they are run too cold or are not bedded in properly. The glazed surface is smooth and slippery, so the pads bite less and braking performance drops off. A driver can sometimes clear light glazing by working the brakes hard to bring their temperature back up.

The minimum allowable weight of a 2026 F1 car, including the driver but not the fuel. Down from 800kg in the previous generation. The weight cut was achieved by shrinking the car's dimensions and components.

The distance between the front and rear axles. In 2026 the maximum has been reduced from 3.6m to 3.4m, making the cars 200mm shorter overall and noticeably more agile in slow corners.

The reinforced structure above and behind the driver's head, designed to protect them if the car flips upside-down. In 2026 the roll hoop must pass a vertical impact test at 20g of force, up from 16g in the previous generation. The change was made following the FIA's review after Zhou Guanyu's Silverstone 2022 crash, where the roll hoop detached.

The titanium loop fitted above the cockpit, surrounding the driver's head. Mandatory in all F1 cars since 2018. It protects the driver from debris (loose wheels, body panels) and from objects intruding into the cockpit during a crash. Widely regarded as the single biggest driver-safety innovation of the modern era.

A new feature for 2026. The nose is designed to crumple in TWO stages during a crash: the front absorbs the initial impact, and if the car spins and hits something else (a secondary impact), a separate crash structure behind the first remains intact. Addresses an issue in previous generations where one bad impact left no protection for a second.

A proximity-triggered power boost introduced in 2026 that replaces DRS as the primary overtaking aid. When a driver is within one second of the car ahead at a detection point, they get +0.5MJ of extra electrical energy to use on the next lap. Peak power available rises to 350 kW, available all the way up to 337 km/h before tapering.

A pit-stop tactic where you pit BEFORE the car you're chasing, so you can use fresh, faster tyres to set quicker lap times. By the time the opponent pits, you've gained enough through-the-air time that you emerge ahead of them.

The opposite of an undercut. You stay out LONGER than your rival, hoping their fresher tyres degrade enough that you maintain your lead when you eventually pit. Works best when track conditions favour older tyres, or when traffic clears late.

A lap driven at maximum attack, with everything optimised for the fastest possible time, as opposed to a slower preparation or cool-down lap. It matters most in qualifying, where a driver gets only a handful of flying laps to set their grid time, but it also appears in the race when a driver needs to build a gap quickly, for example just before a pit stop.

The way a circuit gains grip across a weekend as more rubber is laid down and the surface cleans up. A track is usually at its slowest in FP1 and its fastest by qualifying and the race. Track evolution is a key reason lap times keep tumbling through a weekend, and teams factor it in when reading practice pace.

The fixed number of tyre sets each driver is given for a weekend, and the rules on how they are used. A standard weekend allows a limited pool of dry sets that must be handed back to Pirelli at set points, so teams cannot simply run fresh rubber all the time. Because the pool is limited, teams plan carefully which compounds to save for the race, which shapes their whole strategy.

The rules require every driver to use at least two different dry compounds during a dry race, which forces at least one pit stop. At certain circuits the FIA can impose more. Monaco 2026 carried a mandatory two-stop rule, meaning drivers had to pit at least twice, brought in to force strategic variety at a track where overtaking is extremely hard.

A queue of cars running within one second of each other in the DRS era from 2011 to 2025. Because every car in the line received the DRS boost from the car ahead, none could pull off a clean overtake, so the whole train stayed bunched together. Replaced in effect by the energy train under the 2026 rules.

The 2026 equivalent of the DRS train. Because Overtake Mode hands a following car an electrical deployment boost when it is within a second of the car ahead, the lead car struggles to break away, and cars stay locked together in a line. This kept Antonelli and Russell glued together for 30 laps in Canada, as neither could escape the other's deployment window.

FP1, FP2 and FP3 are the free practice sessions where teams test setups before qualifying. Q1, Q2 and Q3 are the three knockout stages of qualifying that set the grid for the main race, with the slowest drivers eliminated after each stage. SQ1, SQ2 and SQ3 are the equivalent knockout stages of the Sprint Shootout at Sprint weekends. Sprint weekends replace two practice sessions with the Sprint Shootout and the Sprint race.

A short qualifying session held on Friday at Sprint weekends. It sets the grid for Saturday's Sprint race only. Separate from the main Qualifying session, which sets Sunday's race grid.

A short race (roughly 100km, no mandatory pit stops) held on Saturday at six weekends of the season. Points are awarded for the top 8 finishers. Sprint weekends compress the Friday practice schedule to make room for the Sprint Shootout.

Two separate season-long titles. The Drivers' Championship goes to the individual with the most points across the season. The Constructors' Championship goes to the team whose two cars score the most points combined. A Grand Prix awards points to the top ten finishers on a 25, 18, 15, 12, 10, 8, 6, 4, 2, 1 scale, and the fastest lap no longer scores a point. Sprint races award points to the top eight on an 8, 7, 6, 5, 4, 3, 2, 1 scale.

A penalty added to a driver's race time by the stewards. Common values are 5 seconds (minor infraction, e.g. crossing the pit-exit white line), 10 seconds (mid-level, e.g. causing a collision), and 20 seconds (serious, e.g. repeated track-limits violations). Stewards can also issue a drive-through (drive through the pit lane without stopping) or stop-go (stop in the pit lane for a set time with no team work allowed).

When a car is removed from the official classification entirely, usually due to a technical infringement (illegal floor, illegal fuel sample, etc.) or a serious sporting violation. Points are forfeited and the result moves on to the next-classified driver.

A penalty where the driver starts the race from the pit lane rather than their grid position. Happens when changes are made under parc fermé without FIA permission, or as a separate stewards' sanction.

French for "closed park." A regulatory state that begins at the start of qualifying and ends when the car crosses the finish line on Sunday. Once a car is in parc fermé, teams cannot change setup or major components without permission from the FIA. The rule stops teams from running radically different setups in qualifying versus the race.

A road car that leads the field at a controlled speed while a hazard is cleared, such as a crash or debris on track. Overtaking is banned and the pack bunches up behind it. When the track is clear the Safety Car pulls into the pit lane and racing resumes.

A neutralisation of the race without deploying the physical Safety Car. Drivers must hold to a delta time set by race control, keeping everyone a fixed amount slower than normal so no one gains time while a hazard is dealt with. It is quicker to end than a full Safety Car because there is no car to bring back in.

The general term for any period when the race is effectively paused or slowed for safety so a hazard can be handled. It covers the Safety Car, the Virtual Safety Car and a full red-flag stoppage. During a neutralisation drivers cannot race for position in the normal way.

The coloured flags race control uses to signal to drivers. Blue warns a driver they are about to be lapped and must let the faster car past. Yellow means danger ahead, slow down and no overtaking, and double yellow means be ready to stop. Green means the hazard is cleared and racing resumes. Red stops the session entirely. White warns of a slow car ahead. A yellow and red striped flag warns of a slippery surface. Black orders a driver to the pits for a penalty or serious problem, and the chequered flag ends the session.

Mercedes' 2026 challenger, carrying on their W-plus-number naming.

Ferrari's 2026 car. SF stands for Scuderia Ferrari, followed by the year.

Red Bull's 2026 car, the first of the new regulations for the team.

McLaren's 2026 challenger, continuing their MCL naming.

Aston Martin Racing's 2026 car.

Alpine's 2026 challenger.

Williams' 2026 car, carrying the FW initials of founder Frank Williams.

The 2026 car of Red Bull's sister team, Visa Cash App Racing Bulls.

Haas' 2026 car. VF traces back to the team owner's first product, the VF-1 machine tool.

Audi's first car as a full works team, taking over from Sauber for 2026.

The 2026 car of Cadillac, the eleventh team joining the grid this season.